Development of the Commercial Crew Program

  (Redirected from Commercial Crew Development)

Development of the Commercial Crew Program began in the second round of the Commercial Crew Development (CCDev) program, which was rescoped from a technology development program for human spaceflight to a competitive development program that would produce the spacecraft to be used in the Commercial Crew Program to provide crew transportation services to and from the International Space Station (ISS). To implement the program NASA awarded a series of competitive fixed-price contracts to private vendors starting in 2011. Operational contracts to fly astronauts were awarded in September 2014 to SpaceX and Boeing.[1] Each company performed an uncrewed orbital test flight in 2019, and operational flights started in November 2020.

Starting from top image: the Boeing CST-100 Starliner, Crew Dragon, Dream Chaser, and at bottom human-rated Atlas V projects all received developmental funding through CCDev awards and contracts

SpaceX's Crew Dragon Demo-1 2019 flight of Dragon 2 arrived at the International Space Station in March 2019 and returned via splashdown in the Atlantic Ocean. After completion of its test series, a Crew Dragon spacecraft made its first operational Commercial Crew Program flight, SpaceX Crew-1. The flight launched on 16 November 2020.[2] SpaceX launched its second operational flight, SpaceX Crew-2, on 23 April 2021, and is contracted for four additional flights to ISS under the program.

The 2019 Boeing Orbital Flight Test of the CST-100 Starliner spacecraft failed to reach the ISS in December 2019 and will be reflown no earlier than 2022.[3] Pending completion of its demonstration flights, Boeing is contracted to supply six operational flights to ISS.[4] The first group of astronauts was announced on 3 August 2018.[5]

RequirementsEdit

Key high-level requirements for the Commercial Crew vehicles include:

  • Safely deliver and return four crew members and their equipment to the International Space Station (ISS)[6][7]
  • Provide assured crew return in the event of an emergency[6]
  • Serve as a 24-hour safe haven in the event of an emergency[6][7]
  • Capable of remaining docked to the station for 210 days[6][7]


BackgroundEdit

After the retirement of STS in 2011, NASA had no domestic vehicles capable of launching astronauts to space.[8] Artemis, NASA's next major human spaceflight initiative, was scheduled to launch an uncrewed qualification flight in 2016, with an Orion spacecraft atop a Space Launch System (SLS) booster. The NASA had no human-qualified spacecraft available, and in any event SLS/Orion would be too expensive for routine flights to the ISS. In the meantime, NASA continued to send astronauts to the ISS on Soyuz spacecraft seats purchased from Russia.[9] The price varied over time, with the batch of seats from 2016 to 2017 costing $70.7 million per passenger per flight.[10] Artemis continued to slip, with he first flight scheduled for 2022.[11]

Development ProgramEdit

The CCDev program was initiated to develop safe and reliable commercial ISS crew launch capabilities to replace the Soyuz flights. CCDev followed Commercial Orbital Transportation Services (COTS), an ISS commercial cargo program.[12] CCDev contracts were issued for fixed-price, pay-for-performance milestones.[13] CCDev was implemented in several phases. CCDev 1 contracts were for development of concepts and technologies. CCDev 2 contracts were for actual vehicle designs. CCiCap contracts were for designs of complete end-to-end crew transportation hardware and services. CPC phase 1 contracts were for the development of a full certification plan. Finally CCtCap contracts were awarded for actual demonstration of crewed transportation services, which included development, testing, and production of the required hardware followed by operatinal flights to the ISS.

CCDev 1Edit

 
Construction of the Starliner pressure vessel was one of Boeing's CCDev 1 milestones

Commercial Crew Development phase 1 (CCDev 1) consisted of $50 million awarded in 2010 to five US companies to develop human spaceflight concepts and technologies.[12][14][15] NASA awarded development funds to five companies under CCDev 1:

CCDev 2Edit

 
The construction of a Dragon crew mock-up was one of SpaceX's CCDev 2 milestones[disputed ]

On 18 April 2011, NASA awarded nearly $270 million to four companies for developing U.S. vehicles that could fly astronauts after the Space Shuttle fleet's retirement.[21] Funded proposals:[22]

Proposals selected without NASA funding:

Proposals not selected:

CCiCapEdit

 
Flight testing of the Dream Chaser Engineering Test Article was one of Sierra Nevada's CCiCap milestones[disputed ]

Commercial Crew integrated Capability (CCiCap) was originally called CCDev 3.[37] For this phase of the program, NASA wanted proposals to be complete, end-to-end concepts of operation, including spacecraft, launch vehicles, launch services, ground and mission operations, and recovery. In September 2011, NASA released a draft request for proposals (RFP).[38] The final RFP was released on February 7, 2012, with proposals due on March 23, 2012.[39][40] The funded Space Act Agreements were awarded on August 3, 2012, and amended on August 15, 2013.[41][42]

The selected proposals were announced 3 August 2012:

CPC phase 1Edit

The first phase of the Certification Products Contract (CPC) involved the development of a certification plan with engineering standards, tests, and analyses.[43] Winners of funding of phase 1 of the CPC, announced on December 10, 2012, were:[43]

  • Sierra Nevada Corporation: $10 million
  • SpaceX: $9.6 million
  • Boeing: $9.9 million

CCtCap – crew flights awardedEdit

The Commercial Crew Transportation Capability (CCtCap) is the second phase of the CPC and included the final development, testing and verifications to allow crewed demonstration flights to the ISS.[43][44] NASA issued the draft CCtCap contract's Request For Proposals (RFP) on 19 July 2013 with a response date of 15 August 2013.[44] On 16 September 2014, NASA announced that Boeing and SpaceX had received contracts to provide crewed launch services to the ISS. Boeing could receive up to US$4.2 billion, while SpaceX could receive up to US$2.6 billion.[1] In November 2019 NASA published a first cost per seat estimate: US$55 million for SpaceX's Dragon and US$90 million for Boeing's Starliner. Boeing was also granted an additional $287.2 million above the fixed price contract. Seats on Soyuz had an average cost of US$80 million.[45] However, adjusting for the additional cargo carried by Boeing's Starliner inside its crew capsule, the adjusted cost per seat figure is approximately $70 million, which is still higher than SpaceX's Crew Dragon even if the Dragon does not carry the equivalent of a fifth passenger in cargo.[46] Both the CST-100 Starliner and Crew Dragon were to fly an uncrewed flight, then a crewed certification flight, then up to six operational flights to the ISS.[47][48]

TimelineEdit

 
Commercial Crew Program

Ongoing delaysEdit

The first flight of the Commercial Crew Program was planned to occur in 2015, but insufficient funding caused delays.[49][50][51] As the spacecraft entered the testing and production phase, technical issues have also caused delays, especially the parachute system, propulsion, and the launch abort system of both capsules.[52]

Starliner valve issueEdit

Crew Dragon explosionEdit

On 20 April 2019, an issue arose during a static fire test of Crew Dragon.[53] The accident destroyed the capsule which was planned to be used for the In-Flight Abort Test (IFAT).[54] SpaceX confirmed that the capsule exploded.[55] NASA has stated that the explosion will delay the planned in-flight abort and crewed orbital tests.[56]

Crew Dragon crewed flightEdit

On May 30, 2020 two astronauts were launched to the ISS with a Crew Dragon as part of Crew Dragon Demo-2. The end and safe landing of Demo-2 on August 2, 2020 marked the first splashdown in 45 years for NASA astronauts since the first Apollo–Soyuz U.S./U.S.S.R international space mission in July 1975, as well as the first splashdown of a crew spacecraft in the Gulf of Mexico.

FundingEdit

 
Requested vs appropriated funding by year up to 2015

The first flight of the Commercial Crew Program was planned to occur in 2015, but insufficient funding caused delays.[49][51] For the fiscal year (FY) 2011 budget, US$500 million was requested for the CCDev program, but Congress granted only $270 million.[57] For the FY 2012 budget, $850 million was requested and $406 million approved.[50] For the FY 2013 budget, 830 million was requested and $488 million approved.[58] For the FY 2014 budget, $821 million was requested and $696 million approved.[49][59] In FY 2015, $848 million was requested and $805 million, or 95%, was approved.[60] On November 14, 2019, NASA's inspector general published an auditing report listing per-seat prices of $90 million for Starliner and $55 million for Dragon Crew. With these, Boeing's price is higher than what NASA has paid the Russian space corporation, Roscosmos, for Soyuz spacecraft seats to fly US and partner-nation astronauts to the space station. The report also states that NASA agreed to pay an additional $287.2 million above Boeing's fixed prices to mitigate a perceived 18-month gap in ISS flights anticipated in 2019 and to ensure the contractor continued as a second commercial crew provider, without offering similar opportunities to SpaceX.[61] On November 18, 2019, Boeing's Jim Chilton replied that the inspector general's report failed to list Starliner’s positive features and objected to the per seat pricing as they believe the cost is lower than $90 million given its cargo capacity. Boeing's reasoning for the extra funding was due to a later start to its development than SpaceX with comparable deadlines. Boeing also stated it committed to the program.[62] The funding of all commercial crew contractors for each phase of the CCP program is as follows—CCtCap values are maxima and include post-development operational flights.[quantify]

Funding Summary (millions of US$)
Round
(years)
CCDev1[63]
(2010–2011)
CCDev2[64][65]
(2011–2012)
CCiCap[41][42]
(2012–2014)
CPC1[43]
(2013–2014)
CCtCap[48]
(2014–current)
Add. Fund.[66]
(2019)
Total
(2010–current)
Manufacturers of spacecraft
Boeing 18.0 112.9 480.0 9.9 4,200.0 287.2 5,108.1
SpaceX 75.0 460.0 9.6 2,600.0 3,144.6
Sierra Nevada Corporation 20.0 105.6 227.5 10.0 362.1
Blue Origin 3.7 22.0 25.7
Manufacturers of launch vehicles and equipment
United Launch Alliance 6.7 6.7
Paragon Space Development Corporation 1.4 1.4
Total: 49.8 315.5 1,167.5 29.6 6,800.0 287.2 8,648.6

Test MissionsEdit

Each system is required to complete three specific uncrewed test flights and one crewed flight test before NASA will consider the system human-rated. Crew Dragon completed its crewed flight test in 2020 and began operational flights in November 2020. As of October 2021 Starliner has not yet completed a successful uncrewed orbital flight test or its crewed flight test.

Mission Patch Spacecraft Description Crew Date Outcome
Dragon 2
C201 DragonFly (1)
Pad abort test, Cape Canaveral Air Force Station, Florida N/A 6 May 2015 Success
Dragon 2
C204 (1)
Uncrewed test flight. DM-1 launched on 2 March 2019 and docked to ISS PMA-2/IDA-2 docking port a little under 24 hours after launch. The Dragon spent five days docked to ISS before undocking and landing on 8 March 2019. N/A 2 March 2019[67] Success
CST-100 Starliner
Spacecraft 1 (1)
Uncrewed Pad Abort Test N/A 4 November 2019 Success
CST-100 Starliner
Spacecraft 3
Calypso (1)
Uncrewed test flight. Was the first flight of an Atlas V with a dual engine Centaur upper stage. Was originally planned to spend eight days docked to ISS before landing. However, Starliner was unable to rendezvous with the station due to the MET anomaly forcing it to enter a lower-than-expected orbit.[68] The spacecraft returned on 22 December 2019 after spending two days in orbit. OFT-2 was proposed to meet all objectives. N/A 20 December 2019[69] Partial failure due to MET anomaly
Dragon 2
C205 (1)
A Falcon 9 booster launched a Dragon 2 capsule from LC-39A to perform an in-flight abort shortly after Max q in order to test Dragon 2's launch abort system. Abort occurred at 84 seconds after launch and Dragon 2 successfully separated from the Falcon 9 and flew away using its SuperDraco thrusters. The Falcon 9 booster disintegrated as a result of aerodynamic forces. Dragon 2 splashed down nine minutes after launch after successfully deploying its four parachutes. N/A 19 January 2020 Success
  Dragon 2
C206 Endeavour (1)
Crewed test flight. Dragon 2 launched with two crew members and docked to the ISS about 18 hours later. Dragon and its crew spent 62 days on board the ISS.[70]   Doug Hurley
  Bob Behnken
30 May 2020 Success
  CST-100 Starliner
Spacecraft 2 (1)
Uncrewed test flight. Suggested by Boeing and approved by NASA on April 6, 2020 due to the partial failure of Boe-OFT. A Boe-OFT 2 flight attempt was scrubbed before launch on 3 August 2021 and has not yet been rescheduled As of September 2021. N/A NET H1 2022[3] Planned
  CST-100 Starliner Extended crewed test flight.   Michael Fincke
  Barry Wilmore
  TBA
NET Q3 2022[3][71] Planned

Operational missionsEdit

As of October 2021 Crew Dragon has completed one operational mission. The second mission is underway and the third is scheduled for launch in November 2021. Each mission is approximately six months long. Starliner is not epected to fly an operational mission before late 2022.

See alsoEdit

ReferencesEdit

  1. ^ a b Bolden, Charlie. "American Companies Selected to Return Astronaut Launches to American Soil". NASA.gov. Retrieved September 16, 2014.
  2. ^ "Astronauts fly with SpaceX in landmark launch for commercial spaceflight". Spaceflight Now. 16 November 2020. Retrieved 18 November 2020.
  3. ^ a b c Foust, Jeff (13 August 2021). "Starliner test flight faces months-long delay". SpaceNews. Retrieved 13 August 2021.
  4. ^ "Boeing, SpaceX Secure Additional Crewed Missions Under NASA's Commercial Space Transport Program".
  5. ^ "NASA Assigns Crews to First Test Flights, Missions on Commercial Spacecraft". NASA. August 3, 2018.
  6. ^ a b c d Bayt, Rob (July 26, 2011). "Commercial Crew Program: Key Driving Requirements Walkthrough". NASA. Archived from the original on March 28, 2012. Retrieved July 27, 2011.
  7. ^ a b c "Commercial Crew Program – fact sheet" (PDF). NASA. February 2012. Retrieved 14 July 2012.
  8. ^ Denise Chow (April 14, 2011). "NASA Faces Awkward, Unfortunate Spaceflight Gap". Space.com. Retrieved August 10, 2018.
  9. ^ "NASA officials mulling the possibility of purchasing Soyuz seats for 2019". 29 September 2016.
  10. ^ "NASA to Pay $70 Million a Seat to Fly Astronauts on Russian Spacecraft". 30 April 2013.
  11. ^ Daines, Gary (December 1, 2016). "First Flight With Crew Will Mark Important Step on Journey to Mars".
  12. ^ a b "Selection Statement For Commercial Crew Development" (PDF). JSC-CCDev-1. NASA. December 9, 2008. Retrieved February 10, 2011.
  13. ^ "Moving Forward: Commercial Crew Development Building the Next Era in Spaceflight" (PDF). Rendezvous. NASA. 2010. pp. 10–17. Retrieved February 14, 2011. Just as in the COTS projects, in the CCDev project we have fixed-price, pay-for-performance milestones," Thorn said. "There's no extra money invested by NASA if the projects cost more than projected.
  14. ^ "NASA Selects Commercial Firms to Begin Development of Crew Transportation Concepts and Technology Demonstrations for Human Spaceflight Using Recovery Act Funds". press release. NASA. February 1, 2010. Retrieved February 2, 2010.
  15. ^ "Commercial Crew and Cargo Program" (PDF). Archived from the original (PDF) on March 5, 2010.
  16. ^ Jeff Foust. "Blue Origin proposes orbital vehicle".
  17. ^ NASA Selects Boeing for American Recovery and Reinvestment Act Award to Study Crew Capsule-based Design
  18. ^ "CCDev Information". NASA. July 20, 2010.
  19. ^ "SNC receives largest award of NASA's CCDev Competitive Contract". SNC. February 1, 2010. Archived from the original on February 7, 2010.
  20. ^ "NASA Selects United Launch Alliance for Commercial Crew Development Program". February 2, 2010. Archived from the original on December 7, 2013. Retrieved May 19, 2010.
  21. ^ Dean, James. "NASA awards $270 million for commercial crew efforts". space.com, April 18, 2011.
  22. ^ Morring, Frank, Jr. (April 22, 2011). "Five Vehicles Vie To Succeed Space Shuttle". Aviation Week. Archived from the original on December 21, 2011. Retrieved February 23, 2011. the CCDev-2 awards, ... went to Blue Origin, Boeing, Sierra Nevada Corp. and Space Exploration Technologies Inc. (SpaceX).
  23. ^ "Archived copy" (PDF). Archived from the original (PDF) on February 15, 2013. Retrieved 2013-12-05.CS1 maint: archived copy as title (link), p. 2-1
  24. ^ " Blue Origin Technology" Archived January 10, 2018, at the Wayback Machine. Blue Origin. Retrieved February 1, 2016.
  25. ^ "Taking the next step: Commercial Crew Development Round 2". SpaceX Updates webpage. SpaceX. 2010-01-17. Retrieved 2011-01-17.
  26. ^ Boeing Submits Proposal for 2nd Round Of Commercial Crew Dev Archived 2019-06-23 at the Wayback Machine. moonandback.com spaceflight news, December 14, 2010, accessed December 27, 2010.
  27. ^ "NASA Begins Commercial Partnership With United Launch Alliance". NASA. Retrieved 18 July 2011.
  28. ^ Malik, Tariq (2010-02-08). "Scrapped NASA Rocket May be Resurrected for Commercial Launches". SPACE.com. Retrieved 2010-02-10.
  29. ^ "NASA, private firm may team up on Liberty rocket". USA Today. Retrieved 2011-09-13.
  30. ^ "Commercial Crew Program Forum Presentation" Archived October 20, 2011, at the Wayback Machine, p. 7. commercialcrew.nasa.gov, September 16, 2011.
  31. ^ "CCP and Excalibur Sign Space Act Agreement". NASA.
  32. ^ ""Excalibur Almaz, NASA sign commercial spaceflight deal"".
  33. ^ "The Shape of Things to Come – Orbital's Prometheus™ Space Plane Ready for NASA's Commercial Crew Development Initiative" (PDF).
  34. ^ "(press release) Paragon Space Development Corporation Completes All Development Milestones on the NASA Commercial Crew Development Program" (PDF). Paragon. January 31, 2011. Archived from the original (PDF) on July 15, 2011.
  35. ^ Boyle, Alan (February 11, 2011). "Let's talk about the final frontier". Cosmic Log. MSNBC. Archived from the original on February 15, 2011. Retrieved 2011-02-13. the proposal calls for the development of a spaceship that could be sent into space on a variety of launch vehicles. ... "Up to eight crew, Soyuz-like architecture (recoverable reusable crew element, expendable orbital/cargo module). Incorporates HMX's patented integral abort system (uses OMS/RCS propellant in separate abort engines). Can fly on Atlas 401 [a configuration for the Atlas 5 rocket], F9 [SpaceX's Falcon 9] or Taurus II (enhanced) but with a reduced cargo and crew capability on the latter vehicle. Goal is to be the lowest-price provider on a per-seat basis. Nominal land recovery with water backup."
  36. ^ "NASA weighs plan to keep shuttle until 2017 – Technology & science – Space – NBC News". NBC News.
  37. ^ "COMMERCIAL CREW INTEGRATED CAPABILITY". NASA. 2012-01-23. Retrieved 25 January 2012.
  38. ^ "Statement of William H. Gerstenmaier, Associate Administrator for Human Exploration and Operations, National Aeronautics and Space Administration; before the Subcommittee on Space and Aeronautics Committee on Science, Space and Technology; U. S. House of Representatives" (PDF). October 12, 2011. pp. 6–7. Archived from the original (PDF) on September 21, 2012. Retrieved October 12, 2011.
  39. ^ "CCiCap Solicitation". NASA. February 7, 2012. Archived from the original on February 16, 2013. Retrieved February 11, 2012.
  40. ^ "Commercial Crew Integrated Capability Pre-Proposal Conference". NASA. February 14, 2012. Archived from the original on February 17, 2013. Retrieved February 14, 2012.
  41. ^ a b c d e "NASA Announces Next Steps in Effort to Launch Americans from U.S. Soil". NASA. August 3, 2012. Retrieved August 3, 2012.
  42. ^ a b "NASA Announces Additional Commercial Crew Development Milestones". Space Ref. SpaceRef Interactive Inc. August 15, 2013. Retrieved August 16, 2013.
  43. ^ a b c d "NASA Awards Contracts In Next Step Toward Safely Launching American Astronauts From U.S. Soil". NASA. 10 December 2012. Retrieved 11 December 2012.
  44. ^ a b "NASA Commercial Crew Transportation Capability Contract CCTCAP Draft RFP". SpaceREF. July 19, 2013. Retrieved July 22, 2013.
  45. ^ "NASA report finds Boeing seat prices are 60% higher than SpaceX". November 14, 2019.
  46. ^ "Boeing fires back at NASA Inspector General regarding commercial crew report". SpaceNews.com. 2019-11-19. Retrieved 2020-05-25.
  47. ^ Foust, Jeff (2014-09-19). "NASA Commercial Crew Awards Leave Unanswered Questions". Space News. Archived from the original on September 21, 2014. Retrieved 2014-09-21. We basically awarded based on the proposals that we were given," Kathy Lueders, NASA commercial crew program manager, said in a teleconference with reporters after the announcement. "Both contracts have the same requirements. The companies proposed the value within which they were able to do the work, and the government accepted that.
  48. ^ a b "RELEASE 14-256 NASA Chooses American Companies to Transport U.S. Astronauts to International Space Station". www.nasa.gov. NASA. Retrieved 29 October 2014.
  49. ^ a b c Norris, Guy (31 May 2013). "NASA Chief Repeats Warnings On Commercial Crew Delays". Aviation Week.
  50. ^ a b Clark, Stephen (2011-11-23). "Reduced budget threatens delay in private spaceships". Spaceflightnow. Retrieved 18 April 2012.
  51. ^ a b "CSF President Michael Lopez-Alegria Statement on NASA Contract Extension with Roscosmos". Commercial Spaceflight Federation. 2 May 2013. Retrieved 2 May 2013.
  52. ^ "NASA's management of crew transportation to the International Space Station" (PDF). NASA Office of Audits. November 14, 2019. p. 3.
  53. ^ Bridenstine, Jim. "NASA has been notified about the results of the @SpaceX Static Fire Test and the anomaly that occurred during the final test. We will work closely to ensure we safely move forward with our Commercial Crew Program". TWITTER. Retrieved 21 April 2019.
  54. ^ Gebhardt, Chris (August 11, 2017). "SpaceX and Boeing in home stretch for Commercial Crew readiness". NASASpaceFlight.com. Retrieved August 17, 2017.
  55. ^ Mosher, Dave. "SpaceX confirmed that its Crew Dragon spaceship for NASA was 'destroyed' by a recent test. Here's what we learned about the explosive failure". Business Insider. Retrieved 2019-05-06.
  56. ^ "NASA boss says no doubt SpaceX explosion delays flight program". June 18, 2019. Retrieved June 18, 2019.
  57. ^ "Senate Panel Cuts Commercial Crew, Adds Funds for Orion and Heavy Lift". Space News. July 21, 2010. Archived from the original on September 9, 2012. Retrieved 18 April 2012.
  58. ^ McAlister, Phillip (18 April 2013). "Commercial Spaceflight Update" (PDF). NASA. Retrieved 10 August 2013.
  59. ^ Joe Pappalardo (September 16, 2014). "Is the Relationship Between NASA and Private Space About to Sour?". Popular Mechanics.
  60. ^ Clark, Stephen (2014-12-14). "NASA gets budget hike in spending bill passed by Congress". Spaceflight Now. Retrieved 2014-12-15.
  61. ^ BERGER, ERIC (14 November 2019). "NASA report finds Boeing seat prices are 60% higher than SpaceX". Arstechnica. Retrieved 14 November 2019.
  62. ^ Messier, Doug (November 18, 2019). "Boeing Fires Back at Critical NASA IG Report on Starliner". Parabolic Arc. Retrieved May 13, 2020.
  63. ^ "NASA Selects Commercial Firms to Begin Development of Crew Transportation Concepts and Technology Demonstrations for Human Spaceflight Using Recovery Act Funds". press release. NASA. February 1, 2010. Retrieved June 9, 2012.
  64. ^ "NASA Awards Next Set Of Commercial Crew Development Agreements". press release. NASA. April 18, 2011. Retrieved June 9, 2012.
  65. ^ "NASA Releases Commercial Crew Draft RFP, Announces CCDEV2 Optional Milestones". press release. NASA. September 19, 2011. Retrieved June 9, 2012.
  66. ^ "NASA'S MANAGEMENT OF CREW TRANSPORTATION TO THE INTERNATIONAL SPACE STATION" (PDF). Nasa.gov. Retrieved 28 June 2020.
  67. ^ "Demo-1 Flight Readiness Concludes". blogs.nasa.gov. Retrieved 2019-02-22.
  68. ^ Bridenstine, Jim (2019-12-20). "Update: #Starliner had a Mission Elapsed Time (MET) anomaly causing the spacecraft to believe that it was in an orbital insertion burn, when it was not. More information at 9am ET:http://NASA.gov/live". @JimBridenstine. Retrieved 2019-12-20.
  69. ^ Foust, Jeff (9 October 2019). "Boeing, SpaceX press towards commercial crew test flights this year". Spacenews. Retrieved 9 October 2019.
  70. ^ "Launch America – a partnership between NASA and private space companies – will help open the space above Earth to people besides government astronauts". NASA.
  71. ^ Berger, Eric (13 April 2021). "It now seems likely that Starliner will not launch crew until early 2022". Ars Technica. Retrieved 13 August 2021.

External linksEdit